The STM-4D enables the ARC Solo rear-panel sensor input for up to four metering channels for use with Burk Technology digital temperature sensors. Includes one TEMP-OUTDOOR digital temperature sensor with pre-wired 25′ cable, one four-way RJ11 (6P4C) cable adapter and module activation key. Include unit serial number with order.Main Features:Specifications:Tempurature Range: 0.5 C from -10 to 85 C 2 C from -55 to 125 CMetering: Digital sensors take the place of parallel inputs on up to four ARC Solo meter channels.Inputs: Connect up to 4 Burk digital temperature sensors to the ARC Solo rear-panel sensor input via daisy-chain or use the included four-way cable adapter.Cables:-TEMP-INDOOR: Requires SENSOR CABLE, not included TEMP-WALLMOUNT: Includes 14 prewired cable-TEMP-OUTDOOR: Includes 25 prewired cable-TEMP-STACK: includes 25 prewired cable